I find the instructions of this challenge easy to miss understand :
Set someAdjective and append it to myStr using the += operator.
Perhaps it could be re worded to say:
Assign a string of your choosing to the var ‘someAdjective’
Set ‘someAdjective’ to ‘myStr’ using the ‘+=’ operator.
I only bring it up as in the question i personally failed to see the instructions to set a string to the var someAjective, perhaps its just me?